* circuit board
* USB cable
* USB connector to be soldered to circuit board

* Atmel ATtiny2313 in PDIP (and 20-pin socket)
* 12MHz oscillator (Q1)
* Resistors:
   o 150R (R5)
   o 1M (R1)
   o 1k5 (R2)
   o 2x 68R (R3, R4)
* Capacitors:
   o electrolyt 4u7 (C1)
   o 100n (C2)
   o 2x 18p (C3, C4) 
* some LED (D3)
* 2x diode i.e. 1N4007 (D1,D2) 
